1 files changed, 72 insertions, 0 deletions
diff --git a/libstdc++-v3/include/ext/pb_ds/detail/typelist/typelist_at_index.hpp b/libstdc++-v3/include/ext/pb_ds/detail/typelist/typelist_at_index.hpp
new file mode 100644
index 00000000000..a392d12edf1
--- /dev/null
+++ b/libstdc++-v3/include/ext/pb_ds/detail/typelist/typelist_at_index.hpp
@@ -0,0 +1,72 @@
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 2, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING.  If not, write to
+// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
+// MA 02111-1307, USA.
+
+// As a special exception, you may use this file as part of a free
+// software library without restriction.  Specifically, if other files
+// instantiate templates or use macros or inline functions from this
+// file, or you compile this file and link it with other files to
+// produce an executable, this file does not by itself cause the
+// resulting executable to be covered by the GNU General Public
+// License.  This exception does not however invalidate any other
+// reasons why the executable file might be covered by the GNU General
+// Public License.
+
+// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
+
+// Permission to use, copy, modify, sell, and distribute this software
+// is hereby granted without fee, provided that the above copyright
+// notice appears in all copies, and that both that copyright notice
+// and this permission notice appear in supporting documentation. None
+// of the above authors, nor IBM Haifa Research Laboratories, make any
+// representation about the suitability of this software for any
+// purpose. It is provided "as is" without express or implied
+// warranty.
+
+/**
+ * @file typelist_at_index.hpp
+ * Contains typelist utilities.
+ * Typelists are an idea by Andrei Alexandrescu.
+ */
+
+#ifndef PB_DS_TYPELIST_AT_INDEX_HPP
+#define PB_DS_TYPELIST_AT_INDEX_HPP
+
+#include <ext/pb_ds/detail/type_utils.hpp>
+
+namespace detail
+{
+  template<typename Typelist_Chain, int i>
+  struct typelist_chain_at_index_;
+
+  template<typename Hd, class Tl>
+  struct typelist_chain_at_index_<typelist_chain<Hd, Tl>, 0>
+  {
+    typedef Hd type;
+  };
+
+  template<typename Hd, class Tl, int i>
+  struct typelist_chain_at_index_<typelist_chain<Hd, Tl>, i>
+  {
+    typedef typename typelist_chain_at_index_< Tl, i - 1>::type type;
+  };
+} // namespace detail
+
+#endif // #ifndef PB_DS_TYPELIST_AT_INDEX_HPP
+